javascript - 如何使用 Jquery 检查 URL 参数值是否存在？

Question

<select onchange="select_serviceid();" id="exist_service" name="exist_service" class="validate[required] form-control">
    <option value="">Select from existing Service Apartment</option>
    <option value="1">test123</option>
    <option value="2">Test Provab</option>
    <option value="3">Test Provab</option>
    <option value="4">Test Provab dated</option>
    <option value="5">Test Provab123456789</option>
</select>
<script>
   function select_serviceid(){
      var select1 = $( "#exist_service option:selected" ).val();
      var url = document.URL+'?service='+select1;
      $(location).attr('href', url);
   }
</script>

这里我将服务 ID 重定向到 URL 并重新加载它，但我想首先检查当前 URL 中是否有可用的参数。如果不是，那么我添加参数，否则仅更改 id 值。

这是网址

http://192.168.0.24/corporate_rooms/CRS/property/service_basicinfo?service=3

参数服务想要在加载时更改

Answer 1

在选择功能中

onchange="getServiceId(this);" # To pass the value use this parameter

在 JQuery 中

function getServiceId(sel) {
    var id = sel.value;
    if(id == '')
    {
        alert('empty');
    }
    else
    {
        # Your code here
    }
}

<小时/>

编辑01

Get current URL in web browser

var url = window.location.href+'?service='+id;

How to redirect to another page in jQuery?

// similar behavior as an HTTP redirect
window.location.replace(url);

// similar behavior as clicking on a link
window.location.href = url;